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Doc.: IEEE 802.11-04/046r1 Submission January 2004 Tsuguhide Aoki, TOSHIBASlide 1 New preamble structure for AGC in a MIMO-OFDM system Tsuguhide Aoki,

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Presentation on theme: "Doc.: IEEE 802.11-04/046r1 Submission January 2004 Tsuguhide Aoki, TOSHIBASlide 1 New preamble structure for AGC in a MIMO-OFDM system Tsuguhide Aoki,"— Presentation transcript:

1 doc.: IEEE 802.11-04/046r1 Submission January 2004 Tsuguhide Aoki, TOSHIBASlide 1 New preamble structure for AGC in a MIMO-OFDM system Tsuguhide Aoki, Daisuke Takeda, Takahiro Kobayashi and Kazuaki Kawabata Corporate R&D center, TOSHIBA corporation tsuguhide.aoki@toshiba.co.jp

2 doc.: IEEE 802.11-04/046r1 Submission January 2004 Tsuguhide Aoki, TOSHIBASlide 2 Main scope of TGn “Achieve 100Mbps measured at MAC SAP” (PAR & FR) ⇒ MIMO-OFDM is one of the possible candidates. “Some of the modes shall be backwards compatible and interoperable with 802.11a and/or 802.11g” (PAR & FR) Backward compatibility between legacy 11a and MIMO-OFDM is one of the main issues. Preamble structure of 11a should be maintained in a MIMO-OFDM system. Alternatively, use protection mechanisms as defined in 11g (RTS-CTS, CTS self)

3 doc.: IEEE 802.11-04/046r1 Submission January 2004 Tsuguhide Aoki, TOSHIBASlide 3 Example of preamble structure for MIMO system AGC for Tx1 could be performed by using the legacy SP. It is difficult to adjust the gain control for Tx2-Tx4 during MIMO signals because of the insufficient information for other antennas. →This causes a severe saturation or quantization error in ADC. Indicate 11n preamble structure GILPLPLPLP TX1 TX2 TX3 SPSPSig DATA Same as 11a →Backward compatibility DATA TX4 *Similar structure is presented in 03/714r0 Sig 2 GILPLP LPLP -LP-LP LPLP LPLP -LP-LP -LP GILPLP -LP GI-LP-LP LPLP LPLP LPLP LPLP LPLP Channel estimation for MIMO signals GI-LP

4 doc.: IEEE 802.11-04/046r1 Submission January 2004 Tsuguhide Aoki, TOSHIBASlide 4 New preamble structure with 2 nd SPs for MIMO system The 1 st AGC for Tx 1 could be performed by using legacy SP. The 2 nd AGC for MIMO signals could be performed by using the 2 nd SPs. The 2 nd SP with same sequence for Tx1-Tx4 causes a Null (beamforming) effect. -->Different sequence should be used for the 2 nd SP on each antenna. GILPLPLPLP TX1 TX2 TX3 SPSPSig DATA TX4 2 nd SP 2 nd SP for MIMO-AGC GILPLP -LP GILPLP -LP-LP LPLP -LP-LP -LP-LP LPLP LPLP LPLP -LP-LP -LP-LP LPLP LPLP LPLP LPLP 1 st AGC 2 nd AGC Sig2

5 doc.: IEEE 802.11-04/046r1 Submission January 2004 Tsuguhide Aoki, TOSHIBASlide 5 Base-band transmit signals (In-phase) f f f f ・・・ Tx 1* Tx 2 Tx 3 Tx 4 Total transmission power is always the same. *Tx 1 transmits same sequence of legacy SP. SP LPSIG1&22 nd SP MIMO LP MIMO DATA Simulated transmit signals with 2 nd SP

6 doc.: IEEE 802.11-04/046r1 Submission January 2004 Tsuguhide Aoki, TOSHIBASlide 6 Select an antenna with maximum power. Target gain for the selected antenna is used for all RF/IF chains. Base-band transmit signals (In-phase) 1 st AGC 2 nd AGC Rx 1 Rx 2 Rx 3 Rx 4 Simulated receive signals with 2 nd SP 1 st SP 2 nd SP

7 doc.: IEEE 802.11-04/046r1 Submission January 2004 Tsuguhide Aoki, TOSHIBASlide 7 Distribution of the received power for data part and 1 st /2 nd SP part in channel model C(NLOS) Normalized received power of SP (conventional preamble) Normalized received power for data Saturation Quantization error 3 by 3 MIMO-system This figure shows the power of antenna with maximum power in SP(2 nd SP) Normalized received power for data Normalized received power of 2 nd SP (new preamble)

8 doc.: IEEE 802.11-04/046r1 Submission January 2004 Tsuguhide Aoki, TOSHIBASlide 8 Simulation parameters ArchitectureIEEE802.11a-based MIMO-OFDM Antenna elementULA (half a wavelength spacing) Modulation and coding scheme54Mbps(64QAM, R=3/4) Channel modelTGn Channel model (03/940) IF/RF impairmentIgnored Synchronization (Timing sync. Frequency sync.) Ideal Channel estimationIdeal MIMO detection algorithmsMMSE-BLAST(MMSE-based OSIC) DATA length1000 Bytes for each stream ADC10bit-ADC AGCCommon gain AGC (power measurement is ideal)

9 doc.: IEEE 802.11-04/046r1 Submission January 2004 Tsuguhide Aoki, TOSHIBASlide 9 PSDU=1000bytes for each,10bit-ADC BER/PER performance vs. average amplitude of SP in channel model B(NLOS)

10 doc.: IEEE 802.11-04/046r1 Submission January 2004 Tsuguhide Aoki, TOSHIBASlide 10 PSDU=1000bytes for each,10bit-ADC BER/PER performance vs. average amplitude of SP in channel model C(NLOS)

11 doc.: IEEE 802.11-04/046r1 Submission January 2004 Tsuguhide Aoki, TOSHIBASlide 11 PSDU=1000bytes for each,10bit-ADC BER/PER performance vs. average amplitude of SP in channel model D(NLOS)

12 doc.: IEEE 802.11-04/046r1 Submission January 2004 Tsuguhide Aoki, TOSHIBASlide 12 PSDU=1000bytes for each,10bit-ADC BER/PER performance vs. average amplitude of SP in channel model E(NLOS)

13 doc.: IEEE 802.11-04/046r1 Submission January 2004 Tsuguhide Aoki, TOSHIBASlide 13 Conclusions A new preamble structure with 2 nd SP has been examined. The new SP is less demanding on the dynamic range of the AGC. For a given AGC dynamic range, BER /PER performance is improved.

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